Bolster dampening side frame wear plate



0 United States Patent [111 3,548,754

[72] Inventor gay C. wlilllliams [56] References Cited [2n No UNITED STATES PATENTS [22] Filed 27, 9 3,358,614 12/1967 Barber 105/197(D) [45] m d 22 197o 2,129,408 9/1938 Davidson. l0S/197(DB) [73] Assignee Standard Car Truck Company 2,564,346 8/1951 Shaw 105/ 197(D) Chiu'udm 3,408,955 11/1968 Barber 105/197(D) Iwrmnfion J y Primary Examiner-Arthur L. La Point Assistant Examiner-Howard Beltran Attomey-Parker, Carter & Markey ABSTRACT: The railroad car truck side frame which sup- [54] DAMPENING SIDE FRAME WEAR ports the bolster has a separate removable wear plate on each I l side frame column in opposition to the stabilizing wedges carzc aunwmm ried by the side frame. The removable wear plates are of S 2] US, fl 105/ 197. material much more resistant to wear than the structure of the 105/207; 188/1, 188/250 side frame and must be held rigidly in place on the bolsters [51] Int." 6 1 which form the opposite sides of the windowed side frame. F16d 69/04 Each plate is held in position by shoulder bolts extending [50] Field of Search 105/197, through it and by weldments associated with the edges of the I 197D, l97DB, 207; 188/1, 250; 267/3, 4

plate.

SUMMARY OF THIS INVENTION The wear plate of special wear-resisting material is held in place on the frame column by two cooperating fastening elements. In view of the inherent roughness of the side frame column surface and the unavoidable lack of exact flatness of the wear plate, threaded shoulder bolts extending through the plate and countersunk below the surface thereof and projecting through the column are engaged by threaded nuts to hold the plate tightly against the column face. The apertures through which the bolts penetrate are, if more than one, spaced vertically along the center line of the plate and therefore far removed from the edges thereof. Thus, the plate is forced against the column in a pressure area extending ver ti cally on either side of the bolt center and horizontally for the full width of the plate. The pressure effect of the holding bolts tends to relieve the weld of stresses due to a tendency toward movement of the plate away from the column.

Weldments along the vertical edges of the plate in general horizontal alignment with the bolts hold the edges of the plate against movement with respect to the column and tend to relieve the bolts from shearing stresses which would otherwise be set up if sliding movement of the wear plates were not inhibited by the welds. The bolts are further protected from shearing stresses by oversizing the bolt apertures which extend through the columns. Thus, the bolt threads and shanks will normally not contact the columns.

The taper of the countersunk aperture in the wear plate receiving the bolt and the tapered bolt head, together with the presence of the weldments, unite to hold each wear plate in position on the column.

The drawing only discloses the details of a part of the side frame showing the wear plate in position. The relationship between the side frame, the bolster and the wear plates is well illustrated in Pat. No. 3,358,614 issued Dec. 19, 1967 to Franklin D. Barber for Snubbed Railroad Car Trucks.

BRIEF DESCRIPTION OF THE DRAWINGS larged scale.

Like parts are indicated by like characters throughout the specification and drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A railroad car truck side frame is shown at l, windowed at 2, to receive the car truck bolster. The window is bounded on both sides by columns 3, only one side of the column is illustrated. The column on the other side of the window is omitted in the interest of simplicity.

The column 3 is flanged on its innerface to define a wear plate pocket 4 adapted to receive the'wear plate 5. The wear plate is of specially treated wear-resistant material and is generally planar on front and back to engaged the floor of the pocket in the face of the column. The wear plate 5 has two countersunk apertures 6 and 7 vertically spaced along a vertical line approximately along the center line of the plate. Threaded shoulder bolts 9 have conical heads 10 to engage the countersunk surfaces 6 and 7 and shoulders 11 engaging areas 12 to hold the bolt against rotation as the nuts 13 are tightened up against the washers 14 to draw the bolts tight to seat the wear plate 5 in the pocket.

The vertical flanges 15 defining the opposite sides of each pocket 4 are recessed at 16 to permit weldments at 17 in four places, two on each side of the wear plate and horizontally aligned with respect to the holding bolts 9. The apertures 18 which extend through the columns 3 are larger in diameter than the threads 19 and shoulders 20 of the bolts 9.

Iclaim: 1. A railroad car truck having side frames windowed to receive a truck bolster, the window being bounded on opposite sides by generally vertical columns pocketed to receive a removable wear plate, a vertical wear plate adapted to be received in each pocket and having an exposed wear surface, said plate having at least two bolt-receiving apertures in said surface and vertically spaced along the center line of the plate, holding bolts in the apertures, the heads of said bolts being socketed in and below the face of the wear plate, weldments spaced along the opposite edges of the plate between it and the column in generally horizontal alignment with the bolts, vertical flanges defining the pocket in each vertical column and recesses formed in said flanges in horizontal alignment with the bolts to receive the weldments.

2. The device of Claim 1 characterized by the fact that each bolt head is conical to conform to and interlock with the counter-sunk bolt-receiving aperture of said wear plate, shouldered to inhibit rotation of the bolt and the height of the bolt head is less than the depth of the counter-sink. 

